Show ablated feature in ablation summary files

1. Ablation summary files now have an extra column that show the ablated feature. This is useful especially for a large set of features.
2. In addition, the summary file fields that were objects such as lists or dictionaries are now more readable instead of simply being json-dumped strings.

This does mean that the summary files for ablation runs now have an extra column as compared to non-ablation runs but I think the added information is useful.